4a=a+21

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Solution for 4a=a+21 equation: 



4a=a+21

We move all terms to the left:

4a-(a+21)=0

We get rid of parentheses

4a-a-21=0

We add all the numbers together, and all the variables

3a-21=0

We move all terms containing a to the left, all other terms to the right

3a=21

a=21/3

a=7

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